As an important form of centrifugal pump, single-stage double-suction medium-open pump has been widely used in engineering because of its high head and large flow. The impeller of this type of pump is actually composed of two back-to-back impellers, from which the water flows into a volute.
The single-stage double-suction midpump has the following characteristics: it is equivalent to two single-suction impellers of the same diameter working at the same time, and the flow rate can be doubled under the same impeller diameter; Pump shell horizontally open, easy inspection and maintenance, at the same time, the single stage double suction pump inlet and outlet in the same direction and perpendicular to the pump shaft, conducive to the layout and installation of the pump and inlet and outlet water pipe; The impeller structure of the double suction pump is symmetrical, there is no axial force, and the operation is stable. The pumping stations along the Yellow River in China have large flow and high lift, and most of them use double suction centrifugal pumps.
The Huinanzhuang pumping station of the middle line of the South-to-North Water Transfer Project also uses a single-stage double-suction medium-open pump for water supply.
But do you know how to maintain a single stage double suction open pump?
Let us give our dear readers a detailed introduction. The single stage double suction middle open pump is characterized by simple, reliable structure and durability.
Under normal circumstances, it is generally not necessary to disassemble and maintain the pump in a single stage double suction. When the fault is found, it can be removed at any time.
1, maintenance of single-stage double-suction pump should pay attention to several main parts:
A, rolling bearing:
when the bearing wear to a certain extent after long-term operation, it must be replaced.
B, front seal ring, rear seal ring:
when the seal ring wear to a certain extent, it must be replaced.
C, mechanical seal:
single stage double suction pump mechanical seal in the case of no leakage, generally should not be opened to check. If there is serious leakage at the lower end of the bearing body, the mechanical seal should be removed and inspected. When installing and disassembling the mechanical seal, it must be taken lightly, pay attention to the cleaning of the matching surface, protect the mirror of the static ring and the moving ring, and prohibit knocking and collision. The main cause of leakage due to mechanical sealing is the friction of the mirror. The repair method: the end face of the friction pair can be ground to restore the mirror. Another cause of leakage of mechanical seal products is the improper installation of O-rings, or the opening of aging. At this time, the o-ring needs to be replaced and reassembled.
The structural performance of single-stage double-suction medium-open pump:
1. Compact structure, small footprint, large axial size compression
2. Low vibration, low noise, mainly take the following measures to reduce vibration and reduce noise
3. The pump shell adopts double volute structure
4. The axial size of the rotor components is short and the rigidity is good
5. The pump shaft adopts imported high-precision bearings to support
The single-stage double-suction open pump structure description:
SOW series pump is a horizontal center open structure, suction inlet and outlet are under the pump axis, perpendicular to the axis of the horizontal direction, this type of structure pump does not need to disassemble the inlet and outlet pipeline during maintenance, disassembly and maintenance is convenient. The whole rotor is a combination of parts, can be lifted as a whole for easy maintenance, and the same rotor part can be used for reverse rotation.
Both ends of the bearing selection of high-precision imported deep groove ball bearings, smooth operation, low noise, long service life, using grease lubrication. Shaft seal selection mechanical seal or packing seal two types, the user can choose.
